CN116397136A - Self-healing aluminum alloy and preparation method thereof - Google Patents
Self-healing aluminum alloy and preparation method thereof Download PDFInfo
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- CN116397136A CN116397136A CN202211547013.1A CN202211547013A CN116397136A CN 116397136 A CN116397136 A CN 116397136A CN 202211547013 A CN202211547013 A CN 202211547013A CN 116397136 A CN116397136 A CN 116397136A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 159
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005507 spraying Methods 0.000 claims abstract description 106
- -1 polysiloxane Polymers 0.000 claims abstract description 40
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 37
- 239000011248 coating agent Substances 0.000 claims abstract description 36
- 229920002873 Polyethylenimine Polymers 0.000 claims abstract description 35
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 35
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 239000002243 precursor Substances 0.000 claims abstract description 27
- 238000005498 polishing Methods 0.000 claims abstract description 26
- 230000032683 aging Effects 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910002800 Si–O–Al Inorganic materials 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- 229910018131 Al-Mn Inorganic materials 0.000 claims abstract description 4
- 229910018461 Al—Mn Inorganic materials 0.000 claims abstract description 4
- 229910019064 Mg-Si Inorganic materials 0.000 claims abstract description 4
- 229910019406 Mg—Si Inorganic materials 0.000 claims abstract description 4
- 230000003213 activating effect Effects 0.000 claims abstract 2
- 238000001035 drying Methods 0.000 claims description 120
- 238000011282 treatment Methods 0.000 claims description 65
- 238000005406 washing Methods 0.000 claims description 47
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- 238000000889 atomisation Methods 0.000 claims description 24
- 230000035484 reaction time Effects 0.000 claims description 24
- 239000000956 alloy Substances 0.000 claims description 23
- 239000007888 film coating Substances 0.000 claims description 22
- 238000009501 film coating Methods 0.000 claims description 22
- 238000004132 cross linking Methods 0.000 claims description 13
- 238000002791 soaking Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 229910009369 Zn Mg Inorganic materials 0.000 claims description 3
- 229910007573 Zn-Mg Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000008367 deionised water Substances 0.000 claims 1
- 229910021641 deionized water Inorganic materials 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000000707 layer-by-layer assembly Methods 0.000 abstract description 2
- 229910018571 Al—Zn—Mg Inorganic materials 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 238000007744 chromate conversion coating Methods 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 239000002103 nanocoating Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2518/00—Other type of polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2518/00—Other type of polymers
- B05D2518/10—Silicon-containing polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of aluminum alloy surface treatment, in particular to a self-healing aluminum alloy and a preparation method thereof, aiming at the problems, the following scheme is provided, and the aluminum alloy is the following substances: one of pure aluminum, al-Cu, aluminum alloy Al-Mn, al-Si, al-Mg-Si and Al-Zn-Mg is prepared by polishing the surface of the aluminum alloy, polishing the surface to be smooth, activating the surface of the aluminum alloy by hydrothermal pretreatment, preparing a Si-O-Al crosslinked precursor coating by polysiloxane, finally atomizing and spraying polyethylenimine and polyacrylic acid on the surface of the aluminum alloy by using a layer-by-layer assembly technology to construct a self-healing coating, and aging to obtain the self-healing aluminum alloy. Once the aluminum alloy is physically damaged or scratched in the processes of carrying, installing, practical use and the like, the defects can be quickly repaired by the excitation of water molecules in the damp air, and the corrosion resistance of the aluminum alloy is improved. The preparation method is simple, easy to operate, mild in reaction condition, low in cost and beneficial to later maintenance.
Description
Technical Field
The invention relates to the technical field of aluminum alloy surface treatment, in particular to a self-healing aluminum alloy and a preparation method thereof.
Background
Aluminum and its alloys have been widely used in the fields of automobiles, airplanes, medical treatment, electronics, etc. because of their advantages such as low density, high mechanical strength, good plasticity, etc. However, aluminum alloys are susceptible to various types of corrosion, such as intergranular corrosion, stress corrosion cracking, spalling, pitting, and the like. Therefore, it is necessary to perform surface finishing treatments such as plating, micro-arc oxidation, anodic oxidation, chemical conversion coating, etc. on the surface of the aluminum alloy to improve the corrosion resistance of the aluminum alloy. The chemical conversion treatment technology is an effective means for improving the corrosion resistance of the aluminum alloy, and has the advantages of low cost, simple operation and the like.
Among them, the chromate conversion coating has excellent corrosion resistance and good coating adhesion, however, due to its toxicity to humans and the environment, the use of hexavalent chromium-containing coatings or solutions is prohibited by the relevant environmental instructions. Therefore, the development of an environment-friendly surface treatment means is beneficial to the wide application of the aluminum alloy. The high molecular coating has good biocompatibility and can be used for aluminum alloy surface treatment.
However, once the polymer coating is physically damaged or scratched during handling, installation, actual use and the like, the aluminum alloy substrate is exposed to the atmosphere, so that the corrosion rate of the aluminum alloy is accelerated, and the performance of the aluminum alloy is affected. It is therefore necessary to prepare a self-healing coating on the surface of the aluminium alloy.
Disclosure of Invention
Based on the technical problems that the polymer coating is physically damaged or scratched in the processes of carrying, mounting, practical use and the like, the aluminum alloy substrate is exposed to the atmosphere, the corrosion rate of the aluminum alloy is accelerated, and the performance of the aluminum alloy is affected, the invention provides a self-healing aluminum alloy and a preparation method thereof.
The invention provides a self-healing aluminum alloy, which is prepared from the following substances: pure aluminum, al-Cu, aluminum alloy Al-Mn, al-Si, al-Mg-Si, al-Zn-Mg.
Preferably, the preparation method of the self-healing aluminum alloy comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in a sodium hydroxide solution of 150-400 g/L for alkalization treatment, wherein the reaction time is 1-5 h, the reaction temperature is 50-100 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 90-120 ℃ and the drying time is 2-5 h;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=1 to 5: 7-12: 15-30 volume ratio, mixing at a stirring speed of 300-600 rpm for 3-6 h, immersing the hydrothermally pretreated aluminum alloy in polysiloxane solution for crosslinking, wherein the reaction time is 1-3 h, the reaction temperature is 40-65 ℃, then washing with water and drying, the drying time is 2-5 h, the drying temperature is 75-100 ℃, and forming a Si-O-Al crosslinked precursor coating on the surface of the aluminum alloy, wherein the thickness is 11-19 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, sequentially spraying polyethylene imine with the concentration of 5-12 g/L and polyacrylic acid with the concentration of 2-8 g/L, wherein the spraying working distance of atomization spraying treatment is 12-25 cm, the spraying speed is 10-25 mL/min, the spraying time is 8-15S, the water washing drying is carried out, the drying treatment temperature is 85-130 ℃, the drying time is 1-3 h, the spraying-water washing-drying is taken as a spraying cycle, and the steps are repeated for 5-20 times, namely, the polyethylene imine/polyacrylic acid multilayer film coating with the thickness of 2-5 mu m is constructed on the surface of the aluminum alloy, the ageing treatment temperature is 85-130 ℃, and the ageing temperature is 1-5 h.
Compared with the prior art, the invention provides the self-healing aluminum alloy and the preparation method thereof, and the self-healing aluminum alloy has the following beneficial effects:
1. according to the invention, polysiloxane is pre-coated on the surface of the aluminum alloy, and then a polymer coating is sprayed on the surface of the aluminum alloy by utilizing a layer-by-layer assembly technology, so that the coating can provide an effective protection means, and the defects can be quickly repaired by being excited by water molecules in humid air at the beginning of the damage of the coating, and the corrosion resistance of the aluminum alloy is improved.
2. Compared with the conventional high polymer coating, the self-healing coating on the surface of the aluminum alloy not only can enhance the corrosion resistance of the aluminum alloy, but also has the capability of quick, stable and repeated cycle self-healing, and the self-healing coating surface has a large number of amino groups and hydroxyl groups, thereby being beneficial to the subsequent construction of a biological functional surface.
3. According to the invention, firstly, the surface of the aluminum alloy is subjected to hydrothermal alkalization pretreatment, so that an alkalization coating layer can be obtained, a certain corrosion resistance can be provided for the aluminum alloy, then polysiloxane macromolecules are precoated, a crosslinking precursor layer is constructed, so that a matrix material is more compact and uniform, the polysiloxane precursor coating layer has more reactive sites, the subsequent reaction efficiency is facilitated, and the macromolecule coating layer can also provide the corrosion resistance of the aluminum alloy and reduce the corrosion rate of an aluminum alloy matrix.
Drawings
Fig. 1 is a schematic flow structure diagram of a sludge cleaning device for sewage treatment according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
The self-healing aluminum alloy comprises the following substances: pure aluminum, al-Cu, aluminum alloy Al-Mn, al-Si, al-Mg-Si, al-Zn-Mg.
The invention discloses a preparation method of self-healing aluminum alloy, which comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 185g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 2.5h, the reaction temperature is 60 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 95 ℃ and the drying time is 4h;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=3: 7:26 are mixed at a stirring speed of 600rpm for a mixing time of 4 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2.5h, the reaction temperature is 62 ℃, then washing and drying are carried out, the drying time is 2.5h, the drying temperature is 95 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 12.4 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying 10.5g/L concentration polyethylenimine and 7g/L concentration polyacrylic acid, wherein the spraying working distance of atomization spraying treatment is 15cm, the spraying speed is 11mL/min, and the spraying time is 10S. And (3) washing and drying, wherein the temperature of the drying treatment is 130 ℃, and the drying time is 1h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 8 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 2.4 mu m, the temperature of the aging treatment is 110 ℃, and the aging temperature is 4 hours.
Example 2
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in a 350g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 5 hours, the reaction temperature is 95 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 95 ℃ and the drying time is 3 hours;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=3: 9:20 was mixed at a stirring speed of 600rpm for a mixing time of 4.5h. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 60 ℃, then washing and drying are carried out, the drying time is 3.5 hours, the drying temperature is 99 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 13.7 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying 7.5g/L concentration polyethylenimine and 7g/L concentration polyacrylic acid, wherein the spraying working distance of atomization spraying treatment is 21cm, the spraying speed is 22mL/min, and the spraying time is 13S. And (3) washing and drying, wherein the temperature of the drying treatment is 115 ℃, and the drying time is 2.5h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 18 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 4.6 mu m, the ageing treatment temperature is 120 ℃, and the ageing temperature is 3 hours.
Example 3
The embodiment provides a preparation method of self-healing aluminum alloy, which comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 390g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 2 hours, the reaction temperature is 54 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 109 ℃, and the drying time is 2-5 hours;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=3.5: 10.5:27.5 by volume was mixed at a stirring speed of 440rpm for a mixing time of 4.5 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 55 ℃, then washing and drying are carried out, the drying time is 3 hours, the drying temperature is 87 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 16.6 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying 8g/L concentration polyethylenimine and 7g/L concentration polyacrylic acid, wherein the spraying working distance of atomization spraying treatment is 13cm, the spraying speed is 10mL/min, and the spraying time is 9.5S. And (3) washing and drying, wherein the temperature of the drying treatment is 123 ℃, and the drying time is 2h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 12 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 3.0 mu m, the ageing treatment temperature is 100 ℃, and the ageing temperature is 4 hours.
Example 4
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 365g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 4 hours, the reaction temperature is 85 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 100 ℃, and the drying time is 3 hours;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=3: 9:19 was mixed at a stirring speed of 420rpm for a mixing time of 4.5 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 3 hours, the reaction temperature is 55 ℃, then washing and drying are carried out, the drying time is 4 hours, the drying temperature is 80 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 17.0 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying polyethylene imine with the concentration of 7g/L and polyacrylic acid with the concentration of 7g/L, wherein the spraying working distance of atomization spraying treatment is 15cm, the spraying speed is 13mL/min, and the spraying time is 10S. And (3) washing and drying, wherein the temperature of the drying treatment is 122 ℃, and the drying time is 3 hours. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 5 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 2.0 mu m, the ageing treatment temperature is 99 ℃, and the ageing temperature is 4 hours.
Example 5
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in a 260g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 5 hours, the reaction temperature is 55 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 110 ℃, and the drying time is 4 hours;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=4: 11:27 was mixed at a stirring speed of 550rpm for a mixing time of 4 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 43 ℃, then washing and drying are carried out, the drying time is 3 hours, the drying temperature is 87 ℃, and a Si-O-Al crosslinked precursor coating with the thickness of 14.5 mu m is formed on the surface of the aluminum alloy;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying polyethylene imine with the concentration of 5g/L and polyacrylic acid with the concentration of 5g/L, wherein the spraying working distance of atomization spraying treatment is 17cm, the spraying speed is 14mL/min, and the spraying time is 9S. And (3) washing and drying, wherein the temperature of the drying treatment is 111 ℃, and the drying time is 3 hours. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 20 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 4.9 mu m, the aging treatment temperature is 123 ℃, and the aging temperature is 3 hours.
Example 6
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 320g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 1h, the reaction temperature is 88 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 97 ℃ and the drying time is 2h;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=1: 11:25 in a volume ratio of 350rpm for a mixing time of 4.5 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 50 ℃, then washing and drying are carried out, the drying time is 4 hours, the drying temperature is 85 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 15.9 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying polyethylene imine with the concentration of 7g/L and polyacrylic acid with the concentration of 5g/L, wherein the spraying working distance of atomization spraying treatment is 15cm, the spraying speed is 13mL/min, and the spraying time is 15S. And (3) washing and drying, wherein the temperature of the drying treatment is 125 ℃, and the drying time is 2.5h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 10 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 2.7 mu m, the ageing treatment temperature is 90 ℃, and the ageing temperature is 1h.
Example 7
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in a 250g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 5 hours, the reaction temperature is 69 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 113 ℃, and the drying time is 4 hours;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=4.5: 10:27 was mixed at a stirring speed of 450rpm for a mixing time of 4 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 55 ℃, then washing and drying are carried out, the drying time is 4 hours, the drying temperature is 89 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 17.5 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying 7g/L concentration polyethylenimine and 6g/L concentration polyacrylic acid, wherein the spraying working distance of atomization spraying treatment is 15cm, the spraying speed is 14mL/min, and the spraying time is 13S. And (3) washing and drying, wherein the temperature of the drying treatment is 121 ℃, and the drying time is 3 hours. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 7 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 2.2 mu m, the ageing treatment temperature is 102 ℃, and the ageing temperature is 3 hours.
Example 8
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 380g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 2 hours, the reaction temperature is 65 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 105 ℃ and the drying time is 4 hours;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=4: 11:24 was mixed at a stirring speed of 350rpm for a mixing time of 4 hours. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 56 ℃, then washing and drying are carried out, the drying time is 4.5 hours, the drying temperature is 88 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 17 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying polyethylene imine with the concentration of 5g/L and polyacrylic acid with the concentration of 6g/L, wherein the spraying working distance of atomization spraying treatment is 19cm, the spraying speed is 24mL/min, and the spraying time is 12S. And (3) washing and drying, wherein the temperature of the drying treatment is 89 ℃, and the drying time is 2h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 9 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 2.6 mu m, the aging treatment temperature is 115 ℃, and the aging temperature is 2 hours.
Example 9
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 200g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 3.5h, the reaction temperature is 80 ℃, and then washing and drying the aluminum alloy material, wherein the drying treatment temperature is 115 ℃, and the drying time is 3h;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=2.5: 11:17 are mixed at a stirring speed of 400rpm for a mixing time of 5.5h. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2 hours, the reaction temperature is 44 ℃, then washing and drying are carried out, the drying time is 4 hours, the drying temperature is 89 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 12 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying 11g/L concentration polyethylenimine and 7g/L concentration polyacrylic acid, wherein the spraying working distance of atomization spraying treatment is 21cm, the spraying speed is 17mL/min, and the spraying time is 13S. And (3) washing and drying, wherein the temperature of the drying treatment is 122 ℃, and the drying time is 2.4h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated for 13 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 3.2 mu m, the ageing treatment temperature is 124 ℃, and the ageing temperature is 4.5 hours.
Example 10
The embodiment provides a preparation method of self-healing aluminum alloy, which further comprises the following steps:
s1, polishing the surface of an aluminum alloy by using a polishing machine, and rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in 320g/L sodium hydroxide solution for alkalization treatment, wherein the reaction time is 3.5h, the reaction temperature is 67 ℃, and then washing and drying are carried out, wherein the drying treatment temperature is 120 ℃, and the drying time is 4h;
s2, polysiloxane solution is prepared by using V polysiloxane: v ethanol: vwater=3: 7:19 was mixed at a stirring speed of 350rpm for a mixing time of 4.1h. Immersing the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 2.4h, the reaction temperature is 59 ℃, then washing and drying are carried out, the drying time is 4.5h, the drying temperature is 95 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 13 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, and sequentially spraying 11g/L concentration polyethylenimine and 6.5g/L concentration polyacrylic acid, wherein the spraying working distance of atomization spraying treatment is 14cm, the spraying speed is 22mL/min, and the spraying time is 14S. And (3) washing and drying, wherein the temperature of the drying treatment is 100 ℃, and the drying time is 1h. The spraying, water washing and drying are used as a spraying cycle, and the spraying cycle is repeated 11 times, namely, a polyethyleneimine/polyacrylic acid multilayer film coating is constructed on the surface of the aluminum alloy, the thickness of the polyethyleneimine/polyacrylic acid multilayer film coating is 2.9 mu m, the ageing treatment temperature is 90 ℃, and the ageing temperature is 4 hours.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. A self-healing aluminum alloy, characterized in that: the aluminum alloy comprises the following substances: pure aluminum, al-Cu, aluminum alloy Al-Mn, al-Si, al-Mg-Si, al-Zn-Mg.
2. The method for preparing a self-healing aluminum alloy according to claim 1, comprising the steps of:
s1, polishing the surface of an aluminum alloy by using a polishing machine, rapidly carrying out hydrothermal pretreatment on the surface of the aluminum alloy, namely, soaking an aluminum alloy material in a sodium hydroxide solution of 150-400 g/L for alkalization treatment, wherein the reaction time is 1-5 h, the reaction temperature is 50-100 ℃, and then activating the surface of the aluminum alloy through washing, drying and hydrothermal pretreatment;
s2, soaking the hydrothermally pretreated aluminum alloy into polysiloxane solution for crosslinking, wherein the reaction time is 1-3 h, the reaction temperature is 40-65 ℃, then washing and drying are carried out, the drying time is 2-5 h, the drying temperature is 75-100 ℃, and a Si-O-Al crosslinked precursor coating is formed on the surface of the aluminum alloy, and the thickness is 11-19 mu m;
s3, transferring the precursor coating aluminum alloy into an atomization spraying chamber, sequentially spraying 5-12 g/L concentration polyethylenimine and 2-8 g/L concentration polyacrylic acid, washing and drying, repeating the spraying, washing and drying for 5-20 times as a spraying cycle, namely constructing a polyethylenimine/polyacrylic acid multilayer film coating with the thickness of 2-5 mu m on the surface of the aluminum alloy, and carrying out aging treatment to obtain the self-healing aluminum alloy.
3. The method for preparing a self-healing aluminum alloy according to claim 2, wherein the temperature of the drying treatment is 90-120 ℃ and the drying time is 2-5 h.
4. The method of producing a self-healing aluminum alloy according to claim 2, wherein the polysiloxane solution is prepared as a V polysiloxane: v ethanol: vwater=1 to 5: 7-12: 15-30 volume ratio, mixing at a stirring speed of 300-600 rpm for 3-6 h, and water being deionized water.
5. The self-healing aluminum alloy and the preparation method thereof according to claim 2, wherein the spraying working distance of the atomization spraying treatment is 12-25 cm, the spraying speed is 10-25 mL/min, and the spraying time is 8-15 s.
6. The method for producing a self-healing aluminum alloy according to claim 5, wherein the drying treatment is performed at a temperature of 85 to 130 ℃ for a drying time of 1 to 3 hours.
7. The method for producing a self-healing aluminum alloy according to claim 6, wherein the aging treatment is carried out at a temperature of 85 to 130 ℃ for 1 to 5 hours.
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